Technical information: - Power 29kW - Chimney connection Ø150mm - Minimum water quantity is 5cm above the higher connector pipe - Outside measures, width 570mm and length 600mm - Heat conducting area 1.3 m² - Includes grates, fastening pieces, rubber hoses and clamps Use: Make sure that the minimum level of water is reached before lighting the heater. Do not empty the hot tub before the fire in the heater has completely died out and the embers have cooled. In order to reach the specified power output, make sure to maintain a fair-sized fire in the fire box. Empty the heater of ashes after every use. Doing so increases the operating life of the grates. Be sure to read the manual thoroughly before using the heater.